One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,11)(8,9)(10,12)(13,14,19,17)(15,23,18,20)(16,22,26,21)(24,27,25,28)(1,2)(3,4)(5,7,10,8)(6,11,12,9)(13,15,19,18)(14,20,17,23)(16,25,26,24)(21,28,22,27)(5,8,10,7)(6,11,12,9)(13,16,19,26)(14,21,17,22)(15,24,18,25)(20,27,23,28)(5,9,10,11)(6,8,12,7)(13,17,19,14)(15,23,18,20)(16,21,26,22)(24,27,25,28)(13,16)(14,22)(15,24)(17,21)(18,25)(19,26)(20,28)(23,27) involution — undirected(13,18,19,15)(14,23,17,20)(16,25,26,24)(21,28,22,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.